O2 Recovery

  By supplying air from the atmosphere (with an oxygen concentration of 21% and carbon dioxide levels between 450-500 ppm) to the NAGASEP module and reducing the pressure on the permeate side, the air that permeates becomes enriched to an oxygen concentration of 30% and a carbon dioxide level of 1600-2000 ppm. This enriched oxygen can be used in various applications as follows:

1. Combustion Applications (e.g., boilers)

   • Improved Combustion Efficiency: By increasing the oxygen concentration, the heat stolen by nitrogen is reduced, which lowers heat loss from exhaust gases and improves combustion efficiency and flame temperature. A concentration of 22-30% oxygen is sufficient, similar to using pure oxygen but not as high, and at 30%, it can raise the flame temperature by approximately 1.5 times.
   • Reduction in Exhaust Gas Volume: By removing nitrogen, the volume of exhaust gases (nitrogen oxides) is also reduced. Combustion with 30% enriched oxygen air can reduce exhaust gases by about 40%.
   • Fuel Cost Savings: Higher exhaust gas temperatures can lead to significant fuel savings. This is particularly true in the oxygen concentration range of 22-30%, where rapid fuel saving effects can be observed, making it an appropriate field for oxygen-enriched membrane applications.

2. Respiratory Uses

   • Home Oxygen Therapy: Typically, healthy individuals do not consciously feel the need to breathe air (21% oxygen concentration) and do so automatically. However, as an assistive device for people with respiratory diseases who cannot adequately obtain oxygen from the atmosphere, home oxygen therapy allows them to inhale oxygen at home.
   • Recreational Use: Even for healthy individuals, inhaling oxygen can help reduce fatigue and promote recovery from post-exercise fatigue, offering a refreshing benefit.